I found it annoying to change the pinion and the spur is a mission.
There is loads of flex where the motor mount attaches to the chassis as well so setting the mesh is hit or miss.
I cured initial grip roll by moving the shock mounts but the noise of the metal gears becomes embarrassing and sticking a big motor in stripped the cheap spur.
The pinion it came with didn't appear to be round either.
I'm now going to stick cheap rally wheels on it, a silver can motor and cheap ESC in it and let a 7 year old learn to drive round the farm with it!!
Have you looked at the maverick strada or LRP Blast?
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